WO1982002328A1 - Dispositif d'isolation d'un burin par rapport aux vibrations - Google Patents

Dispositif d'isolation d'un burin par rapport aux vibrations Download PDF

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Publication number
WO1982002328A1
WO1982002328A1 PCT/US1981/000027 US8100027W WO8202328A1 WO 1982002328 A1 WO1982002328 A1 WO 1982002328A1 US 8100027 W US8100027 W US 8100027W WO 8202328 A1 WO8202328 A1 WO 8202328A1
Authority
WO
WIPO (PCT)
Prior art keywords
chisel
vibration isolator
friction member
tool
set forth
Prior art date
Application number
PCT/US1981/000027
Other languages
English (en)
Inventor
Douglas D Reynolds
Original Assignee
Douglas D Reynolds
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Douglas D Reynolds filed Critical Douglas D Reynolds
Priority to PCT/US1981/000027 priority Critical patent/WO1982002328A1/fr
Publication of WO1982002328A1 publication Critical patent/WO1982002328A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D3/00—Hand chisels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G1/00—Handle constructions
    • B25G1/01—Shock-absorbing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G3/00—Attaching handles to the implements
    • B25G3/02—Socket, tang, or like fixings
    • B25G3/12—Locking and securing devices
    • B25G3/24—Locking and securing devices comprising clamping or contracting means acting transversely on the handle or socket

Definitions

  • This invention relates generally to a vibration isolating hand grip for use with hand held pneumatic tools and more particularly to a chisel vibration isolator for controllably guiding an impact-driven tool chisel.
  • V F vibration-induced white finger
  • Smith consists of an air operated chisel gripping element supported within a shell by a pair of rubber ring-type isolators.
  • the grip is clamped onto the chisel shank at a fixed, predetermined position by inflating an internal bladder to force the bladder into contact with the chisel shank.
  • An improvement on this earlier isolation grip is disclosed in U.S. Patent Re. 29,402 issued to Daniel Bronson Shotwell on September 20, 1977.
  • the Shotwell isolation grip provides a manually actuatable pump for the inflation of an internally disposed bladder for fixedly clamping the grip at a predetermined position on the chisel shank.
  • the tool shank-contacting bladder elements were spaced from an outer manually grippable rigid sleeve by a pair of rubber rings or end walls.
  • attentuation of vibration from the chisel shank to the operator's hand was dependent upon the vibration energy attenuation characteristics of the bladder and rubber spacer rings which were further limited by factors such as optimum size, weight and durability.
  • OMPI -3- tool particularly in removing internal flash or working in tight or confined spaces.
  • the present invention is directed at overcoming one or more of the problems as set forth above.
  • a chisel vibration isolator for controllably guiding an impact-driven tool is constructed to slidably extend about a tool chisel during operation and includes a means for selectively clamping the isolator in fixed relationship relative to the chisel.
  • Current chisel-vibration isolating grips are fixedly clamped at a predetermined position on a chisel shank prior to operation of the tool by a worker.
  • the present isolators are not easily adaptable to work situations requiring frequent repositioning of the isolator on the chisel shank.
  • the amount of attenuation provided is restricted by design limitations and in particular by the physical characteristics of the material used in the construction of the isolator.
  • the present invention solves the above problem by clamping the isolator to the chisel shank only during those periods of time when it is necessary to move or reposition the chisel, such as when moving the tool assembly from one workpiece to the next, or for momentarily providing retention of the chisel within the tool head.
  • the present invention slidably extends about the chisel shank leaving the shank free to reciprocate within the isolator. In this manner, the primary vibration forces, i.e., those which are parellel to the longitudinal axis of the chisel shank, are not communicated to the isolator and hence the requirement for large scale vibration absorption is avoided.
  • the present invention provides a construction for impeding the transmission of secondary or lower amplitude vibrations directed normal to the longitudinal axis of the chisel.
  • FIG. 1 is an isometric view of a tool chisel slidably mounted within the chisel vibration isolator of the present invention.
  • Fig. 2 is a side sectional view of a preferred embodiment of the present invention shown in Fig. 1.
  • Fig. 3 is a cross-sectional view of the preferred embodiment of the present invention taken along the lines III-III in Fig. 2.
  • Fig. 4 is a side sectional view of a second embodiment of the present invention shown in Fig. 1.
  • Fig. 5 is a cross-sectional view of the second embodiment of the present invention taken along the lines V-V in Fig. 4.
  • a chisel vibration isolator 10 for controllably guiding an impact-driven tool chisel according to the present invention is shown in conjunction with a hexagonally-sectioned tool chisel
  • the chisel vibration isolator 10 includes a rigid, preferably metal, tubular outer case 14, having an outer cylindrical surface 16, an inner surface 18, and an elasto eric liner 20, preferably constructed of 30 durometer neoprene rubber, centrally disposed within the outer case 14.
  • the liner 20 has an outer surface 22 generally conforming to the inner surface 18 of the case 14, and an inner surface 24 concentrically formed with respect to the outer surface 22.
  • the chisel vibration isolator 10 also includes a first means 26 for slidably extending about the chisel 12 during normal operation of the chisel.
  • the first means 26 includes a cylindrically shaped outer surfafce 28 disposed adjacent and generally conforming with the inner surface 24 of the elastomeric liner 20 and a hexagonally-shaped chisel-guiding surface 30 generally conforming to the cross-sectional shape of the tool chisel 12.
  • the chisel-guiding surface 30 has a diametrical dimension slightly larger than that of the chisel section.
  • the first means 26 of a material having a dynamic coefficient of friction with steel of less than 0.15.
  • plastic materials selected from the group consisting of acetal resin, fluoroplastic, polya ide, and migratory internally lubricated thermplastic have -6- the desired low-friction characteristics.
  • PTFE polytetrafluoroethylene
  • TFE polytetrafluoroethylene
  • TFE has excellent mechanical and thermal properties.
  • TFE is commercially available under the trade names of Teflon TFE (DuPont) , Holon TFE (Allied Chemical) or Fluon (ICI America) .
  • copolymer acetal resins which are harder than TFE, have a coefficient of friction with steel of 0.15, and have somewhat lower thermal properties.
  • Polyamides known more commonly as nylons, generally have excellent physical properties and low coefficients of friction.
  • molybdenum disulfide filled nylon is widely used as a self-lubricating bearing material in industrial equipment.
  • migratory internally lubricated thermoplastics have been developed. These compounds are blends of resins such as nylon or acetal and silicone, are self lubricating, and have excellent wear and low friction characterictics.
  • Each of the retaining rings 32,32' includes an annular metallic ring 34,34' having a plurality of radially disposed threaded bores 36,36' and is bonded or molded in place between a pair of 30 durometer neoprene rubber caps 38,38' and 40,40'.
  • the retaining rings 32,32' have a radially outer dimension substantially equal to inner surface 18 of the case 14 and are retained in -7- position, adjacent each of the axial ends of the tubular case 14, by a plurality of screws 42,42' extending through the case 14 and threadably engaging the threaded bores 36,36' formed in the rings 34,34'.
  • the elastomeric liner 20 and the first means 26 also respectively have a rectangular opening 44,46 extending radially through the liner 20 and the first means 26.
  • the chisel vibration isolator 10 also includes a second means 48 for selectively controllably clamping the isolator 10 in fixed position relative to the tool chisel 12.
  • the second means 48 includes a friction member 50 movably disposed within the rectangular openings 44,46 for movement between a first position at which the friction member 50 is spaced from tool chisel 12, as shown in the drawings, and a second position at which the friction member 50 is in contact with the chisel 12.
  • the friction member 50 is preferably constructed of bronze, brass, or other material having a high coefficient of friction with steel.
  • a manually actuatable control bar 52 is attached in fixed, spaced relationship to the friction member 50 by a pair of machine screws 54,54' extending respectively through a pair of tubular spacers 56,56' interposed the control bar 52 and the friction member 50.
  • the second means 48 also includes a third means 58 for maintaining the friction member 50 in the above-described first position.
  • the third means 58 includes a pair of coil springs 60,60' placed around the spacers 56,56' to apply a biasing force betv/een the case 14 and the control bar 52 to urge the control bar 52 radially outwardly and thereby space the attached friction member 50 away from the tool chisel 12.
  • the chisel vibration isolator 10 also includes a reaction member 62 having a friction surface 64 disposed adjacent the -8- chisel-guiding surface 30 of the first means 26.
  • the reaction member 62 is preferably constructed of bronze, brass, or other friction material, and is disposed within a rectangular recess 66 provided in the liner 20 and the first means 26 at a position radially spaced from the friction member 50.
  • the reaction member 62 is retained within the recess 66 by a pair of screws 68,68' extending through the outer case 14.
  • a tool chisel 12 of the desired configuration is inserted axially through the isolator 10, so that a shank portion of the tool chisel 12 is slidably supported within the isolator 10.
  • the isolator 10 is then oriented in the operator's hand so that the operator's fingers comfortably rest on the control bar 52.
  • the control bar is depressed by the operator to clamp the vibration isolator 10 to the tool chisel 12 for movement as a single unit, and the shank end of the chisel 12 is inserted into a tool receiving socket of a tool head.
  • the tocl head containing an operating switch therein, is generally supported in the right hand and the chisel vibration isolator is supported in the left hand.
  • finger pressure on the control bar 52 is relaxed and the third means 58 acts to space the friction member 50 away from the chisel 12.
  • the chisel 12 is free to move in an axial direction independently of the isolator 12, and is controllably guided laterally by the chisel-guiding surface 30 of the first means 26.
  • finger pressure is selectively reapplied to the control bar 52, thereby clamping the
  • the reaction member 50 provides an added friction surface 64 which is generally not required for most smaller tool chisels, but may be desirable for additional clamping action when the isolator 10 is used with large or heavy tools.
  • chipping hammers having a retention-free tool receiving socket, i.e., the tool chisel 12 is not physically restrained within the tool head. This feature presents no problem when the chisel
  • the chisel 12 is working against a reactive force.
  • the chisel 12 may momentarily be unimpeded by any reactive force and, in the absence of physical restraint, become axially extended from the tool head.
  • the operator can prevent the undesired separation of the chisel 12 from the tool head by momentarily applying a light or moderate finger pressure to the control bar 52. This action brings the friction member
  • the first means 26 the elastomeric liner 20, and the case 14 that have widely diverse mechanical properties.
  • the characteristic impedances of adjacent materials should be vastly different to provide a high degree of impedance mismatching between adjacent materials and thereby reduce the transmission of vibration therebetween.
  • the elastomeric liner 20 is preferably constructed of a rubber material that is significantly softer and has a substantially lower characteristic impedance than either the metal case 14 or the polytetrafluoroethylene first means 26.

Abstract

Un dispositif d'isolation par rapport aux vibrations (10) sert au guidage commande d'un burin a percussions (12). Les niveaux eleves de vibrations subits pendant des temps prolonges par des operateurs manipulant des outils de choc a haute frequence peuvent causer des dommages physiques a la main de l'operateur qui tient le burin. Ce probleme est resolu en montant un dispositif d'isolement des vibrations du burin (10) qui s'etend de maniere coulissante autour du burin (12) pendant le fonctionnement normal et peut se fixer selectivement sur le burin (12) seulement lorsque cela est necessaire pour le mouvement ou repositionnement d'une tete d'outil ou du burin (12) recu a l'interieur. La presente invention est particulierement utile pour des marteaux piqueurs utilises en fonderie pour enlever les bavures des pieces coulees brutes.
PCT/US1981/000027 1981-01-08 1981-01-08 Dispositif d'isolation d'un burin par rapport aux vibrations WO1982002328A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US1981/000027 WO1982002328A1 (fr) 1981-01-08 1981-01-08 Dispositif d'isolation d'un burin par rapport aux vibrations

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/US1981/000027 WO1982002328A1 (fr) 1981-01-08 1981-01-08 Dispositif d'isolation d'un burin par rapport aux vibrations
WOUS81/00027810108 1981-01-08

Publications (1)

Publication Number Publication Date
WO1982002328A1 true WO1982002328A1 (fr) 1982-07-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1981/000027 WO1982002328A1 (fr) 1981-01-08 1981-01-08 Dispositif d'isolation d'un burin par rapport aux vibrations

Country Status (1)

Country Link
WO (1) WO1982002328A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157172A1 (fr) * 1984-03-05 1985-10-09 Waldemar Link (GmbH & Co.) Ciseau chirugical
FR2859936A1 (fr) * 2003-09-22 2005-03-25 Gb Metallurg Outil tel que burin, pointerolle pourvu d'un dispositif de protection

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044625A (en) * 1976-07-01 1977-08-30 Chicago Pneumatic Tool Company Vibration isolating hand grip for shank of a percussive chisel
USRE29402E (en) * 1974-05-15 1977-09-20 Caterpillar Tractor Co. Vibration isolating grip for pneumatic hand tools

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE29402E (en) * 1974-05-15 1977-09-20 Caterpillar Tractor Co. Vibration isolating grip for pneumatic hand tools
US4044625A (en) * 1976-07-01 1977-08-30 Chicago Pneumatic Tool Company Vibration isolating hand grip for shank of a percussive chisel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157172A1 (fr) * 1984-03-05 1985-10-09 Waldemar Link (GmbH & Co.) Ciseau chirugical
FR2859936A1 (fr) * 2003-09-22 2005-03-25 Gb Metallurg Outil tel que burin, pointerolle pourvu d'un dispositif de protection

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